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Professor Oak's lecture, also named Professor Oak's Big Pokémon Encyclopedia (Japanese: オーキド博士のポケモン大検定Doctor Okido's Big Pokémon Encyclopedia) in the Diamond & Pearl series and Professor Oak's Pokémon Live Caster (Japanese: オーキド博士のポケモンライブキャスターDoctor Okido's Pokémon Live Caster) in the Best Wishes series, is a segment featured at the end of anime episodes in Japan.

Generally, the lecture will start with Professor Oak using the reels of a slot machine to show the silhouette of a Pokémon. The display on his computer will switch to show the image of the Pokémon, surrounded by some general information. He will then show some clips of the Pokémon in the anime as he discusses it. After this, he will show a live example of the Pokémon in his laboratory. Frequently, the Pokémon will attack or hurt him shortly after. The lecture sometimes closes with Professor Oak reciting a Pokémon senryū.

Pokémon senryū (Japanese: ポケモン川柳) are haiku-like poems about Pokémon or Pokémon-related themes. Composing them is a hobby of Professor Oak usually used to close his lectures in the anime.

Senryū are generally light-hearted or humorous, and they consist of three lines with 17 or fewer morae. Unlike haiku, senryū do not require a kigo (season word). The art form was created in the Edo era of real-world Japan by Senryū Karai (柄井川柳, 1718-1790).

There are also some special lectures, such as those which will promote an upcoming movie or discuss one of the characters. For example, in DP075, the Pokémon senryū was replaced by Pikachu's Movie Memory, as part of a countdown to Giratina and the Sky Warrior.

The segment was briefly replaced by the Pokémon Trivia Quiz beginning with AG105 until it returned with the beginning of the Diamond & Pearl series.

The segment has never been used in the dub, though footage from the lecture of Alakazam was used to introduce the VHS release of Mewtwo Strikes Back. Also, segments for Slowpoke, Starmie, and Marowak were dubbed for a promotional VHS tape called "Pokémon Insider: The Video."

Trivia

Between EP061 and AG090, all but five Generation I and II Pokémon are given a lecture. The five omitted are Kadabra, Mew, Mewtwo, Porygon and Porygon2. Kadabra may have been omitted because of the issues with Uri Geller, Porygon and Porygon2 due to EP038, and Mew and Mewtwo due to their status as the most unknown legendary Pokémon in the anime.